Telephone set for communication in airplanes



G. KLEIN 2,182,727

TELEPHONE SET FOR COMMUNICATION IN AIRPLANES Filed June 26, 195'? Patented Dec. 5,1939

-, UNITED STATES} PATENT orrlcl-z 1 Gesellschaft mit beschriifnkter Battling, Berlin, Germany, a corporation of Germany Application June 26,1937, Serial No. 150,429.

In Germany June 27, 1936 v 3 Claims. (o1. 179-156) My invention relates to telephone sets for communication in airplanes, and more particularly to a casing for receivers adapted to be used in con-' nection with aviators helmets and is directed generically to the same subject matter as is disclosed in the copending application of Karl Wenzky, Serial No. 163,077, filed September 9, 1937. Y The'object of my invention is to provide a casing for the receiver simple to manufacture, -light in weight and which will exclude all outside noises so as to permit a clear signal reception by the aviator. To this end, the casing and the bearing points for securing the constituent ele 5 ments of the telephone receiver are made ofone piece having the form of a-shell and surrounding the ear of the'user. The casing must therefore be of solid material and is preferably made of a light metal so as not to considerably increase 20 the weight of the aviators helmet or the like while at the same time upon a reduction of air.

pressure it properly seals the ear so as to exclude any noises which might interfere 'with a clear understanding. The advantage of such an ar-,

5 rangement is also the saving in weight by the omission--01 the customary prior art separate receiver casing.

The casing is preferably given an oval or round shape in orderto'adapt it comfortably'to the. 30 ear. Within the casing in the central portion thereof is provided a circular threaded .flange which receives the several constituent elements of the telephone mechanism. The telephone mechanism is firmly secured within the casing 5 by screws or the like, a socket supporting the diaphragm and the cover of the telephone engaging the threaded flange. "lhe casing is secured to the aviators helmet or the like by means of a spring ring placed in the casing and fastened to the material of the helmet, the helmet lin ng consisting, for instance, of lamb skin or the like resiliently covering the open inner side of the casing and being provided at this point with openings for the passage of the sound in order 45 to atta n a clear understanding with the smallest possible pressure.

In the accompanying drawing isshown an I embodiment of my invention ii -diagrammatic form;

receiver embodying my invention in connection w th an aViator s helmet shown in part and in Fig. .1 shows a'vertical sectional view of the tem, the diaphragm and the cover being removed.

The casing l which preferably has the shape as shown in Figs. land 2 is provided in its central portion with'a flat pad'la, surrounded by a circular flange 2 which together with pad la and 5 the casing forms one single piece, preferably an 7 aluminunr'die casting. The telephone magnet system 3 which in this case is of the two-coil type is supported on pad la within the circular flange 2 and is secured tothe casing l by screws 10 15. The laterally projecting parts of the magnet system 3 are provided with plug connections 4 which pass through openings l6 arranged in the flange 2. Onto the end of flange 2 is threaded the ring 1 which serves as a support for the diaphragm 5 and by which it is positioned over or infront of the magnet system 3. A centrally perforated cover 6 holds the diaphragm to ring 1. The position of the ring- I is set by a locking ring 8, also threaded onto flange 2, in order to secure the desired distance between the diaphragm 5 and the pole pieces of the magnet system. To secure the telephone leads of the he met leading to the telephone each end of the magnet system 3 is' prov ded in the neighborhood of the plug connections 4 with a terminal 9 also supported by easing I, and to which the leads extending to the helmet are connected.

The rim ll of easing I is slightly inwardly upset as shown in Fig 1, so that it can be-flrmly r secured to the aviators helmet ill by means of ing, for instance, of lamb skin which forms an elastic pad between the ear and the casing (as shown by the dash lines in Fig. 1) and is provided with openings ll for-the passage of the sound. In th s manner a casing for telephones 5 is provided which is particularly useful for aviators helmets. o1' simple construction. light in weight, easily to be secured to the helmet :and which will exclude all outside noises.

I claim as' my invention: 5o 1. A detachable telephonerecever in particular for aviators helmets or the like, comprising a shell-shaped casing of solid material, fashioned to circumscribe the ear of the user and having in its central interior portion a supporting pad 5 and an annular wall surrounding said pad, both integral with the casing wall and shaped to support individually the several constituent elements of the receiver mechanism in operative relation to one another, and a spring ring on the helmet for supporting said casing at its rim, the wall of the helmet having a yielding portion covering the inside of said casing and being provided with perforations for transmitting the sound to the ear of the user.

2. In combination, an aviators helmet having an opening therein, and a telephone receiver casing attached to said helmet exteriorly thereof and acoustically sealing said opening, said casing being fashioned to circumscribe the ear or the wall surrounding said base and integral therewith, and operative elements oi! a telephone receiver attached directly to said base and wall, respectively.

GERALD KLEIN. 

